Enable nova Verbose logging

With oslo-incubator commit 751c35b1c8ff0730883a8ccdda9b77a49fff2405,
(Change-Id: Ic9e3cb5979b2d7283552ad3a461870373f45a239)
Verbose does not enable debug level logging.

Change-Id: I1741ec0ca61e4c7234ee4e29cbd52ded73995451
Merge "Enable nova Verbose logging"